Preliminary Design Report
18
Extrusion Screw and Housing Design
Table 1 displays the material densities gathered from a chart published on simetric.co.uk.
Using these densities, a rudimentary screw and screw housing design have been started.
Table 1: Ingredient Densities
Ingredient Density (Kg/m^3)
Density (Lb/in^3)
flour 593.00 0.0214
sugar 849.00 0.0307
brown sugar 721.00 0.0260
salt 1200.00 0.0434
baking powder 721.00 0.0260
baking soda 689.00 0.0249
As seen in Table 1, the salt has the highest density; therefore one would surmise that the
dispensing design will be critical on the salt properties because of the higher amount of mass in
the system when salt is used. However, the information that is actually critical in this regard is
the viscosity, not the density. This can be assumed because the amount of mass in this system is
so miniscule that the inertial forces involved to move the mass can be disregarded. This
assumption was affirmed by discussing the design with engineers working with the Molon
Motors Company. Based on this information, it can be assumed that the brown sugar will be the
most critical part of the dispensing design. This assumption has been made based on the fact that
all of the ingredients are dry and powder like with the exception of brown sugar which usually
has molasses or some other type of viscous syrup. This assumption was affirmed by talking with
a technical sales person with the Augers Unlimited Company.
Based on the information gathered by talking to representatives from Augers Unlimited
and Molon Motors, two screw designs could be implemented. This information is shown in
Table 2. These designs represent a rough range for the auger screw. Screw Design 1 being the
smallest and Screw Design 2 being the largest. Therefore, there is an expected volume range of
0.3 in
3
to 14.5 in
3
of material being pushed out by the screw at any given time.
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